A flight of doves
Doves, along with their close relatives the pigeons, are one of the most successful species of birds for a reason. Because of their small stature, they are a little more skittish than most and will avoid trouble at all costs while they quietly go about their business.
Physically, doves aren't much to write home about. They tend to dress conservatively and draw as little attention to themselves as possible, although they do conform to traditional standards of beauty. No one would ever call a dove ugly, but they won't be paying much attention if a peacock is at the party.
If the affable and meek nature of the dove personality evokes some derision from more aggressive birds, it gets respect because of its association with peace, and as the symbol of coming together in harmony, doves are released on many occasions to symbolize cooperation and non-aggression. Perhaps this is why -- when it comes to their personal lives -- doves make friends so easily. However, their relationships can sometimes seem a bit shallow to the other party, even if the dove doesn't see it that way.
The dove's reputation for being a little air-headed is well deserved, for they don't pay much attention to politics or current events and never question authority. It's not so much that they respect the system, it's just that they never think about it. Doves assume the best of everyone, which can leave them vulnerable to scams, but their level-headedness usually wins the day.